Brianemone Posted December 21, 2004 Report Share Posted December 21, 2004 hey when you have an old bulb does the amount of light it puts out lessen (visiblly or actual light for the corals) or is it just a change in colour temperature? Quote Link to comment Share on other sites More sharing options...
suphew Posted December 21, 2004 Report Share Posted December 21, 2004 Both I think Quote Link to comment Share on other sites More sharing options...
Brianemone Posted December 21, 2004 Author Report Share Posted December 21, 2004 will my fish go blind?? seriously will my corals need to adjust at all?? Quote Link to comment Share on other sites More sharing options...
suphew Posted December 21, 2004 Report Share Posted December 21, 2004 Bulbs (all types) should be replaced after 6 months to a year because of this. Just do one at a time so everything can adjust to the new brightness. Quote Link to comment Share on other sites More sharing options...
Brianemone Posted December 21, 2004 Author Report Share Posted December 21, 2004 i only have one will be interesting to see the colour change Quote Link to comment Share on other sites More sharing options...
suphew Posted December 21, 2004 Report Share Posted December 21, 2004 Dont know that you will be able to see it, I can only see changes in mine if I put and old and new bulb in at the same time. This is why so many people resist spending the money, its doesn't really "look" much different unless you have two side by side to compare. Quote Link to comment Share on other sites More sharing options...
Brianemone Posted December 21, 2004 Author Report Share Posted December 21, 2004 the new bulb is 20k so ill definatly see the difference of the colour do you notice a big difference side by side?? (N.b all those of you who are going to say that 20k is too blue need not bother) Quote Link to comment Share on other sites More sharing options...
suphew Posted December 22, 2004 Report Share Posted December 22, 2004 Bit hard with MH cause they are so bright its hard to look at them but fluros, yep. Quote Link to comment Share on other sites More sharing options...
lduncan Posted December 22, 2004 Report Share Posted December 22, 2004 The amount of light outputted doesn't change (much), but the spectrum does change a lot. I think the reason why this happens is because the different elements in the bulb (mecury, iodine, bromine etc) react with the quartz envelope over time, created different elements which emit different colour light. Layton Quote Link to comment Share on other sites More sharing options...
suphew Posted December 22, 2004 Report Share Posted December 22, 2004 Maybe the spectrum goes out of the visible range? Cause there is definately a difference in visible brightness between old and new bulbs, if you put them side by side and compare Quote Link to comment Share on other sites More sharing options...
lduncan Posted December 22, 2004 Report Share Posted December 22, 2004 no doubt that it does, I think more infa red is emitted. Also the eye is non linear in sensing different colour, although two colours may have the same measured intensity, one may appear dimmer than the other with the human eye. That probably has an effect as well. Layton Quote Link to comment Share on other sites More sharing options...
Brianemone Posted December 28, 2004 Author Report Share Posted December 28, 2004 fantastico the new bulb is awesome makes that tank look 20k times better Quote Link to comment Share on other sites More sharing options...
jetskisteve Posted December 28, 2004 Report Share Posted December 28, 2004 Good to hear Brian.How blue is it? Quote Link to comment Share on other sites More sharing options...
Brianemone Posted December 28, 2004 Author Report Share Posted December 28, 2004 id call it refreshingly blue (nice and clean) not sickly Quote Link to comment Share on other sites More sharing options...
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